Striking mechanism for electric bells



(Model.)

7 G. E. BOWERS. STRIKING'MBGHANISM FOR ELECTRIC BELLS.

N'0.;252-,1'75 Palsented Jan. 10,1882.

INVENTOR WITNESSES ATTORNEYS.

UNITED STATES PATENT OFFICE.

GEORGE E. BOWERS, OF FITGHBURG, MASSACHUSETTS.

STRIKlNG MECHANISM FOR ELECTRIC BELLS.

SPEGI FIOATIO N formingpart of Letters PatentNo. 252,175, dated January10, 1882.

' Application filed September 8,1881. (ModoL) To all whom it mayconcern:

Be it known that I, GEORGE E. BoWERs, of Fitchburg, in the county ofWorcester and State of Massachusetts, have invented a new and usefulImprovement in Striking Mechanism for Electric Bells, of which thefollowing is a full, clear, and exact specification.

My improved mechanism providesforalong stroke of the hammer, movement ofthe hammer always in one direction, compactness of construction, and apositive stop in a manner requiring but slight force to release thestriking mechanism.

The invention consists in a hammer in the form of a segment of a ring,hung 011 ashaft that is revolved by a weight or spring and released bymovement of the armature of an electro-magnet, as hereinafter describedand claimed.

Reference is to be had to the accompanying drawings, forming part ofthis specification,-in which similarletters of reference indicatecorresponding parts in all the figures.

In the drawings, Figure lis asideelevation of an electric gong embodyingmy invention. Fig. 2 is a front view of the same. Fig.3 is a detail sideview of the hammer and its shaft, in section, on line a: a: of Fig. 2.Fig. 4. is an edge view of'the hammer, and Fig. 5 is a detail section online y y of Fig. 2.

The bell and mechanism are supported by a bracket consisting ofa ring,A, and arm B, to which the ring is attached.

G is the gong, suspended from the upper side of ring A.

D is the magnet, hung on arm B.

a is the pivoted armature-lever, which draws downward from the polesofthe magnet by its weight, assisted by a spring, if required.

I) is a stop for the armature.

c is a shaft-carryingIa winding-drum,rl, from which a weight, 6, issuspended bya cord that passes overafriction-rollenf.

g is the hammer-shaft, provided with a fast pinion, h, meshing with agea1- wheel,a, on shaft 0.

E is the hammer, hungloosely byan arm, i, on the shaft g. 0n the shaftis a ratchetwheel, 7r, that is engaged by a pawl, I, hung on thehammerarm 11, so that the hammer is carried by the shaft when the shaftis turned by the weight 0.

The hammer E is the segment of a ring, pivoted at one end by a pin, m,to the arm 7;, so that its outer end is free to swing in and out adistance limited by a stop-pin, a, that projects through a hole in atail of the hammer. Aspring, 0, from the pawl l to the hammer, serves toretain the hammer end inward, and also as a spring to retain the'pawl inplace. The hammer-arm z'has an extensiomp, curved in the same are as thehammer, and. forming a tail to the hammer. On the end of this tailportion 19 is a cross pin, q, and on the armature-lever a are two lugsor projections, r r, placed one for contact with the end of pin q whenthe armature is down, and the other for contact therewith when thearmature is raised in contact with themagnet. This contact with the lugsr by pin q arrests the hammer and prevents its being revolved by theweight.

The location of the curved hammer is below the edge ofthe bell, atoneside, in such position that. the hammerstrikes at about the end of itsupward movement. As the shaft 9 carries the hammer, the centrifugalforce acting on the long arm overcomesthe resistance ofthe spring actingagainst the short arm and throws the end of long arm out, so as to comein contact with the bell, which checks it and allows the spring on shortarm to force the end of long arm inward, when it passes the bell andmoves on until arrested by the pin q and upper lug 1". When the armatureis raised by closure of the circuit to the magnet the upper lug r israised above pin q and the lower lug 1' brought behind the pin. When thearmature drops by breakage of the circuit the lower lug r is carrieddown, and the pin q being entirely released, the hammer revolves, andthe blow is struck at completion of the revolution.

It will be seen that the movement of the hammer is continuous in onedirection, so that there is no loss of power. The hammer has a longstroke and moves with increasing momentum. The position of the hammer atrest is such that it partially balancesthe driving power, so that but aslight magnetic force is required to release the hammer; and, further,the stop action-is positive and endwi se of the armature.

A pawl, s, on the bell-frame engages the notched hub t on-the hammer-armi, and serves to retain the hammerin position, if at any time theimpelling'forc'e is relieved.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. The combination, with the shaft 9, carrying ratchet-wheel k, of the hammer E, hung loosely on arm 1', projectingfrom shaft 9, the stop-pin n, passing through a cross-slot or hole inthe hammer-tail p, the spring 0, and. the pawl l, pivoted on said arm15, whereby the hammer is adapted to be operated :with respect to thebell as described.

2. The combination of segment-hammer E, propelling-shaft g, arm 6,tail-piece 12, provided 20 with pin q, and the armature-lever 11,provided with lugs r, substantially as shown and de-' scribed.

3. The combination of the impeding-shaft g, ratchet k, pawl 1, 'arm 5,pivoted hammer E, 25 and stop-lever a, substantially as shown anddescribed, for operation as set forth.

GEORGE E. BOWERS.

VVitrie'sses:

" B. J. HAMMOND,

' L. O. ALBEE.

